Why do I get a solve error above 100+ in MovieClipEditor while following the MatchTrackBlend DVD tutorial?
Most errors will be fixed by inproving the trackers' accuracy.
There are a few tools you can use:

On the tracking window's dopesheet sort your trackers by average error.
This will show you which trackers are not tracking correctly.



On the graph window look for places where the graphs are clearly different than the rest.



To fix those issues Retrack, reposition, resize, affine, use a different kind of motion model algorithm  or tracking preset or do whatever you can to improve the accuracy of those trackers to to bring down the error average..